Bugfix: Only allow rank==0 to clean up old checkpoints (#2558)

kmn1024

2025-06-25 443bc09c11f3cf89ffc573aab2021f0c933aa5b3

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1    12
2    1
3    2
4    3
5    4
6    5
7    6
8    7
9    8
10    9
11    10
12    11